R2511-HP MSR Router Series Voice Configuration Guide(V5)

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Table 10 Group B backward signals
Desi
g
nation Basic Meanin
g
B-1 Spare for national use
B-2 Send special information tone
B-3 Subscriber line busy
B-4 Congestion
B-5 Unallocated number
B-6 Subscriber line free, charge
B-7 Subscriber line free, no charge
B-8 Subscriber line out of order
B-9 through B-15 Spare for national use
The following figure shows the exchange process requesting calling party information, which is typical of
R2 interregister signaling.
Figure 22 ITU-T R2 interregister signaling exchange process
Line signaling exchange
Originating side
Terminating side
Calling number: 123
Called number 789
Send called number digit 7 (I-7)
Request next digit (A-1)
Send called number digit 8 (I-8)
Request calling party information (A-5)
Send calling accounting category 2 (II-7)
Request calling party information (A-5)
Send calling number digit 1 (I-1)
Request calling party information (A-5)
Send calling number digit 2 (I-2)
Send calling number digit 3 (I-3)
Send number terminator (I-15)
Request next digit (A-1)
Send called number digit 8 (I-9)
All digits are received completely (A-3)
Send calling service category 2 (II-2)
Subscriber idle and charging starts (B-6)
Line signaling exchange
Request calling party information (A-5)
Request calling party information (A-5)